Thae box is 7.5 cubes after sub displacement and tuned to 36 htz. There is 28 inches of port per sub.......Jake Ballerd(my brother) , the owner of DB Linc Audio.....is doing this build and he is the best arround so im just going on his word for the builds....honestly the pics do no justice.....the setup is MASSIVE!!!!!! We hooked them up to a sundown 3000d yesterday and it was INSANE!!!!!!!!!!!!!! And no port noise!!!!!!